stat tests

The following stat based methods are provided: 
dev, ino, mode, nlink, uid, gid, rdev, size, atime, mtime, 
ctime, blksize, and blocks. See "stat" in perlfunc for details.

Each of these can take a number of targets, which will follow Number::Compare semantics.
 $rule->size( 7 );         # exactly 7
 $rule->size( ">7Ki" );    # larger than 7 * 1024 * 1024 bytes
 $rule->size( ">=7" )
      ->size( "<=90" );    # between 7 and 90, inclusive
 $rule->size( 7, 9, 42 );  # 7, 9 or 42